$OpenBSD: patch-unix_uxcons_c,v 1.1 2016/09/10 13:03:42 ajacoutot Exp $
--- unix/uxcons.c.orig	Sat Sep 10 12:06:10 2016
+++ unix/uxcons.c	Sat Sep 10 12:06:24 2016
@@ -6,6 +6,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <sys/select.h> /* fd_set */
 #include <assert.h>
 #include <errno.h>
 
